Abstract
Specifically deuterated dodecyltrichlorosilane, (Cl{sub 3}Si(CH{sub 2}){sub 10}CD{sub 2}CH{sub 3}), was synthesized and reacted with porous chromatographic grade silica to obtain a labeled alkyl-modified surface. Subsequently, {sup 2}H NMR quadrupole echo spectra were recorded, and spin-lattice relaxation times (T{sub 1}) were calculated for the material in the presence of organic and hydroorganic solvents, an aqueous surfactant solution, and the nematic phase of a thermotropic liquid crystal. Line width, shape, and T{sub 1} were sensitive to changes in the interfacial conditions. The spin-lattice relaxation rate (T{sub 1}{sup {minus}1}) was found to be linearly related to the square of the line width at its half-height ({Delta}{nu}{sub 1/2}{sup 2}). These results suggest that the motional averaging process for the C-{sup 2}H bond is a combination of fast and intermediate molecular fluctuations similar to those observed in other restricted systems such as lipid bilayers and micellar systems.
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